A new element, X, is discovered and is found to have 3 isotopes: X-130, X-132, and X-134. 50% of all atoms of element X are X-130; 40% are X-132; and the remaining 10% are X-134. What is the atomic mass of this new element? (Enter the number only and keep 1 decimal, as in 000.0 )

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

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